This issue is likely caused by your phone's service provider. However, the following steps might solve your issue:
1. Reach out to your phone service provider and ask them if they are experiencing problems receiving SMSs from the USA via Amazon SMS Service (PlayerAuctions' service provider).
2. Give it a bit of time, and then try again later. Perhaps your phone service provider is experiencing a temporary network glitch.
3. Try using a different phone or phone number.